Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province. (Photos: Xinhua)

Photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area after a snowfall in Nanzheng District of Hanzhong, northwest China's Shaanxi Province.

Aerial photo taken on Dec. 20, 2020 shows tourists enjoying the snow scenery in Longtoushan scenic area in Nanzheng District of Hanzhong, northwest China's Shaanxi Province.

Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province.

Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province.

Aerial photo taken on Dec. 20, 2020 shows the scenery in Longtoushan scenic area during sunrise in Nanzheng District of Hanzhong, northwest China's Shaanxi Province.